Unstable / Flaky tests in tst_qquickanimations

The tests in qquickanimations are unstable.

After analysing the following builds
QtDeclarative_5.4_Integration: From build_00627 to build_00427
QtDeclarative_dev_Integration: From build_02663 to build_02463
QtDeclarative_5.5_Integration: From build_00157 to build_00001

Some tests were failing in:

[simpleProperty] # flaky
osx-10.9 developer-build
http://testresults.qt.io/ci/QtDeclarative_5.5_Integration/build_00052/macx-clang_developer-build_OSX_10.9
http://testresults.qt.io/ci/QtDeclarative_5.4_Integration/build_00449/macx-clang_developer-build_OSX_10.9

[simplePath]
windows gcc developer-build
http://testresults.qt.io/ci/QtDeclarative_5.4_Integration/build_00563/win32-mingw48_developer-build_qtlibinfix_opengl_Windows_7
http://testresults.qt.io/ci/QtDeclarative_5.4_Integration/build_00554/win32-msvc2010_developer-build_angle_Windows_7
http://testresults.qt.io/ci/QtDeclarative_5.4_Integration/build_00502/win32-msvc2010_developer-build_qtnamespace_Windows_7

[reparent]
windows msvc-2012 64bit developer-build
http://testresults.qt.io/ci/QtDeclarative_dev_Integration/build_02508/win64-msvc2012_developer-build_qtnamespace_Windows_81
http://testresults.qt.io/ci/QtDeclarative_5.5_Integration/build_00091/win32-msvc2010_developer-build_angle_Windows_7

[simpleAnchor] only real failure + flaky
http://testresults.qt.io/ci/QtDeclarative_dev_Integration/build_02650/win32-msvc2010_developer-build_angle_Windows_7
http://testresults.qt.io/ci/QtDeclarative_dev_Integration/build_02580/win32-msvc2010_developer-build_angle_Windows_7
http://testresults.qt.io/ci/QtDeclarative_5.4_Integration/build_00487/win32-msvc2010_developer-build_angle_Windows_7
http://testresults.qt.io/ci/QtDeclarative_5.4_Integration/build_00622/win32-msvc2010_developer-build_angle_Windows_7

[Bunch of flaky tests] see BLACKLIST file in https://codereview.qt-project.org/#/c/109989/
http://testresults.qt.io/ci/QtDeclarative_5.5_Integration/build_00098/win32-msvc2010_developer-build_angle_Windows_7

Tests were also failing in:
http://testresults.qt.io/ci/QtDeclarative_dev_Integration/build_02642/macx-clang_developer-build_OSX_10.10 // aborted
http://testresults.qt.io/ci/QtDeclarative_dev_Integration/build_02642/macx-clang_developer-build_OSX_10.9 // aborted
But note that those builds were aborted.